In large mixing bowl, cream butter/margarine and sugars until smooth. Add eggs one at a time, mixing until just blended, add vanilla. Carefully add dry mixture to creamed sugar until well-blended. Mix in chocolate chips.

Drop in teaspoonfuls onto ungreased cookie sheet and bake 10-15 minutes until golden brown (depending on whether you like crunchy or chewy...baking time will vary)

This is a particularly yummy recipe. I always made these for my students when they had basketball or volleyball games as a reward for doing their best.